The fact that Eldiana had come at all is important. That she had stayed despite the carnage and the torture the blood mages were throwing out at everyone meant she cared. Having any "outsider" care about the state of the mages isn't something that's easily put to words, as Eldy herself likely knows well.

"Not at all," Wynne assures her. "We all have our part to play in the state of the world. You have to lead the fight against the Blight. They'll find a way to rebuild with or without us. You're the reason we had any survivors at all. We very easily could have lost everything."

Everything and everyone. If that had been the case, Wynne doesn't know what she would have done. The Circle, for all its unpleasantness and prison-like atmosphere, has always been her home. Despite some of her less than pleasant choices and memories wrought from those choices, the mages, and some of the templars, are her family. Eldy's as well, she imagines. Not having the assurance that "home" is safe and will always be there is a gut-wrenching realization.